<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
          <!-- 警告区域 -->
          <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false">
          </el-alert>
          <!-- 选择商品分类区域 -->
          <el-row class="cat-opt">
            <el-col>
              <span>选择商品分类：</span>
              <!-- 选择商品分类的级联选择框 -->
              <el-cascader v-model="selectedCateKeys" :options="cateList" :props="cateProps" @change="handleChange">
              </el-cascader>
            </el-col>
          </el-row>
          <!-- tabs页签区域 -->
          <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <el-tab-pane label="动态参数" name="many">
              <!-- 添加参数按钮 -->
              <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
              <!-- 动态参数表格 -->
              <el-table :data="manyTableData" border stripe>
                  <!-- 展开列 -->
                  <el-table-column type="expand">
                    <template slot-scope="scope">
                      <el-tag v-for="(item, i) in scope.row.attr_vals" :key='i' closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                      <!-- 输入的文本框 -->
                      <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                      </el-input>
                      <!-- 添加按钮 -->
                      <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                    </template>
                  </el-table-column>
                  <!-- 索引列 -->
                  <el-table-column type="index"></el-table-column>
                  <el-table-column prop="attr_name" label="参数名称">
                  </el-table-column>
                  <el-table-column label="操作">
                    <template slot-scope="scope">
                      <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                      <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                  </el-table-column>
                </el-table>
            </el-tab-pane>
            <el-tab-pane label="静态属性" name="only">
              <!-- 添加属性按钮 -->
              <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
              <!-- 静态属性表格 -->
              <el-table :data="onlyTableData" border stripe>
                  <!-- 展开列 -->
                  <el-table-column type="expand">
                    <template slot-scope="scope">
                      <el-tag v-for="(item, i) in scope.row.attr_vals" :key='i' closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                      <!-- 输入的文本框 -->
                      <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                      </el-input>
                      <!-- 添加按钮 -->
                      <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                    </template>
                  </el-table-column>
                  <!-- 索引列 -->
                  <el-table-column type="index"></el-table-column>
                  <el-table-column prop="attr_name" label="参数名称">
                  </el-table-column>
                  <el-table-column label="操作">
                    <template slot-scope="scope">
                      <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                      <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                  </el-table-column>
                </el-table>
            </el-tab-pane>
          </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
          <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
              <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
          </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
          </span>
        </el-dialog>
        <!-- 编辑参数对话框 -->
        <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
          <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
              <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
          </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
          </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
  data() {
    return {
      // 存储商品分类列表
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定的数组
      selectedCateKeys: [],
      // tabs标签页默认选中的tab
      activeName: 'many',
      // 动态属性的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 控制编辑对话框的显示与隐藏
      editDialogVisible: false,
      // 修改参数的表单对象
      editForm: {
        attr_name: ''
      },
      // 修改表单的验证规则
      editFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    /* 获取所有的商品分类列表 */
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.cateList = res.data
      // console.log(this.cateList)
    },
    /* 级联选择框选中项变化，会触发这个函数 */
    handleChange() {
      this.getParamsData()
    },
    /* tabs 页签点击事件的处理函数 */
    handleTabClick() {
      this.getParamsData()
      console.log(this.activeName)
    },
    /* 获取参数的列表数据 */
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        // 解决当重新选择商品，而商品刚好不等于3，应当下边列表清空
        this.manyTableData = []
        this.onlyTableData = []
        return false
      }
      // 否在证明选中的是三级分类
      // console.log(this.selectedCateKeys)
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制按钮与文本框的切换显示
        item.inputVisible = false
        // 文本框中输入的内容
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
        console.log(this.manyTableData)
      } else {
        this.onlyTableData = res.data
        console.log(this.onlyTableData)
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog(attrId) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attrId}`,
        {
          params: { attr_sel: this.activeName }
        }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 监听编辑对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，修改参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据Id删除对应的参数项
    async removeParams(attrId) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      // 用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！')
      }

      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attrId}`
      )

      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }

      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 文本框失去焦点，或按下Enter都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        // console.log(row.inputValue)
        // console.log(row.inputVisible)
        return false
      }
      // 如果没有return，则证明有输入的内容，需要做后续处理(只是保存到页面)
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求，保存这次操作
      this.saveAttrVals(row)
    },
    // 将对 attr_vals 的操作， 保存到时数据库
    async saveAttrVals(row) {
      // 需要发起请求，保存这次操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功！')
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // nextTick 方法的作用：当页面上的元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      // 需要发起请求，保存这次操作
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 计算属性
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style Lang="less" scoped>
.cat-opt {
  margin: 15px 0;
}
.el-tag {
  margin: 15px;
}
.input-new-tag {
  width: 120px;
}
</style>
